#define _CRT_SECURE_NO_WARNINGS

#include<stdio.h>
int main()
{
	int high, up, down;
	scanf("%d %d %d", &high, &up, &down);

	int sum = 0;
	int day = 0;
	while (sum != high)
	{
		day++;
		sum += up;
		if (sum == high)
			break;
		sum -= down;
	}
	
	printf("%d", day);
	return 0;
}